Condenser



F. J. GIVEN Sept. 6, 1938.

CONDENSER Filed 001; 20, 1934 FIG. 5

FIG. l

FIG. 2

lNl ENTOR F. J. GIVEN A ORNEY Patented Sept. 6, 1938 I CONDENSER Frederick J. iven, East Orange, N. J), assignor v to Bell ,Telephone Laboratories, Incorporated, I

New York, N. Y., a corporation of New York This invention relates to condensers and more particularly to a device for maintaining a concontainer from which it is insulated and spaced by an insulating compound. The insulating compound also serves to seal the container and thus protect the unit from the entrance of mois ture. While this method has beensuccessful in connection with bulky condensers, it is not sumciently reliable for small compact condensers of the above type where clearan e between the unit and container is small and w ere the design is such that the length of the condenser is large as compared to its cross-sectional dimensions.

The latter conditions are often encountered in .condensers for use in small, lightweight appacally locating the condenser unit centrally in the casing for the purpose of securing uniform capacitance between the unit and the casing.

In accordance with the present invention these and otherobjects are attained by placing a spacing member around the unit in such a manner that the thickness of said member substantially regulates the thickness of the layer of potting compounding encasing said unit.

In the preferred form of the invention an insulated wire, the diameter of which approaches the desired thickness of the ensheathing layer of insulating compound, is placed around the unit and the unit is then inserted into the casing.

The exact shape which this wire spacer takes may vary depending upon the particular design of condenser with which it is to be used. However, in one type of condenser in which the unit tends to rest upon the bottom of the casing, the wire may assume the shape of an open U which Application October 20, 1934, Se 3, 24, v r

I i 5 aims. (on. 1-15-41) device onto the unit while it is being inserted terminals l0 suitably attached thereto.

supports the bottom of the unit from the bottom or the casing with extensions of said 0 continuing around the sides 61 said unit in opposite directions and approximately parallel to the bottom "of the casing. This device will maintain 5 the unit equidistantly from the bottom and sides of the casing. In some instances it may be expedient to use one of these devices on each end of the .unit and these may be supplemented with one or more single wires bent around the sides of the .unit intermediate its ends.

In accordance with another feature of the invention, the spacing members are so arranged as .to permit the potting compound to flow freely throughout the length of the casing thereby insuring an equal distribution of compound around the condenser unit. r

By using an insulated wire, the natural tension of the wire is utilized in holding the spacing 20 into the casing. It will be apparent however, that other insulating material may be employed in place of wire.

, This invention will be more clearly understood from the accompanying detailed description and drawing in which:

Fig.'1.is a view of a single condenser unit hav- -ing a spacing member attached thereto in accordance with the invention;

Fig. 2 is an enlarged view of the condenser unit spacing member; j Fig. 3 is a view of a pair of rolled condenser units having a spacing device attached at each end and an intermediate spacing member between the ends; 5

Fig. 4 is a view of the condenser unit with the spacing device attached and inserted into a condenser casing; and

' Fig. 5 is a cross-sectional view of the insulated wire preferably usedin making the spacing device shown in Fig. 2.

Referring to Fig. *1 there is shown a rolled paper and foil condenser unit, 9'which has been pressed'into a rectangular shape and a pair of At the lower end of this unit there is attached a spacing member II. This member II which is more clearly shown in Fig. 2 is made of a U-shaped member, preferably of insulated wire, which fits about the end of the condenser unit at l2 and has extensions l3 and H of the sides of the U projecting approximately parallel to the end of the unit and around the sides thereof. The insulated wire as shown in Fig. 5 comprises a metal core 23 which is covered by an insulating cov- 5 ering 24 preferably ofpaper pulp. It will be noted, as shown in Figs.- 1 and 2, that the projecting members l3 and ll do not extend around the unit to-entirely enclose it but that spaces l5 and it are left between the sides of the U-shaped member and its extensions I! and N on either side of the condenser unit. These spaces serve 1 to permit the insulating compound to flow theremember.

through and to surround the unit completely.

These features are more clearly understoodby referring to Fig. 4 which shows a condenser unit 9 having a spacing member I I attached at the lowerend and inserted into a container l1, shown in partial cross-section; which may be of metal or other material. As shown in the drawing, the spacing member ll maintains the unit 9 out of contact with the container i1 and at the same time centrally locates the unit in the'con'tainer,

the distance between the unit and the container .being the diameter of the wire forming the spacvwthe spacing members ll may be bent slightly so that the natural tension of the wire will cause it to cling onto the unit while the unit is being inserted into the container. It isobvious that other suitable materials may replace insulated wire as the material from which to construct the spacing However, small insulated wires make inexpensive and satisfactory spacing members and such wires insulated with paper pulp have been found to be particularly satisfactory.

' Referring to Fig. 3, there is shown a plurality of condenser units! and 20 associated together in theconventional manner and having a pair of spacing members II and I! attached to opposite ends of the unit thus permitting even spacing and insulation when they are inserted into a container in accordance with Fig. 4. As a. means of further insuring even spacing ofthe unit in the casing, an

. additional spacing member 2i may be placed around the I unit intermediate its ends. This member comprises an insulated wire placed around the unit and having an opening 22 therethrough for the passage of insulating compound.

What is claimed is: v

1. in electrical condenser comprising a condenser unit, a casing therefor, and means comprising a stiff member in the form of a U supporting said condenser unit from the bottom of said casing, and an integral stiff extension of said U extending substantially parallel tothe bottom of said casingaround the sides of said unit, said member and said extension being capable of withstanding without deformation the temperatures above the melting point of a sealing compound employed for sealing said unit in said casing.

2. In an electrical condenser, a condenser unit sealed in a casing, and means comprising a stiff insulated wire in the form of a U supporting said unit out of contact with the bottom of said casing, and stiff extensions of said U bent in opposite -directions around the sides of said unit and so arranged that a sealing compound is free to flow to the bottom of the casing, saidmember and,

, as to determine substantially the minimum thickness of the layer of sealing compound encasing said unit.

4. In a condenser, a condenser unit and a casing therefor, a stiff spacing member bent around said unit and formed of insulated wire having a diameter substantially equal to the clearance between said unit and easing, said spacing memher having an opening therein to permit passage of insulating compound therethrough, said insulated wire being retained on said unit solely by the inherent tension extended by said wire on said un t.

5. Ari-electrical condenser comprising a condenser unit, a housing therefor, a U-shaped member comprising a still insulated wire on the bottom of said unit for supporting the bottom of said unit andfor separating the bottom of said unit from the bottom of said housing, said U- shaped member having extensions continuing around the sides of said unit and being approximately parallel to the bottom of said housing, a second U-shaped member comprising a stiff insulated wire on the top of said unit, said second U-shaped member having extensions continuing around the sides of said unit and being approximately parallel to the top of said unit, a stiif intermediate wire surrounding said unit, said extensions and said intermediate wire having approximately the same diameter, said extensions and said intermediate wire having openings therein'to permit the passage of rinsulating compound therethrough and said U-shaped members and said intermediate wire being retained on said units solely by the inherent tension of the respective members and wire on said unit.

FREDERICK J. GIVEN. 

